Jendrik Brack — DevOps Engineer & Sysadmin

Hello — I’m Jendrik. I work as a DevOps engineer with a systems-administration background and have about ten years of experience in cloud and on‑prem infrastructure, Infrastructure-as‑Code (IaC), and automation.

My focus areas include Azure, Kubernetes, Terraform, CI/CD pipelines, and improving the developer experience through pragmatic automation. In my posts I share practical recipes, tools, and approaches that help teams deliver more reliably and faster.

Technically, I enjoy working with .NET, PowerShell, Hugo, and common CI/CD tools; I’m always focused on repeatable deployments, clean builds, and pragmatic operational automation.

If you have topic suggestions or want to discuss collaboration, feel free to contact me via the project page or by e‑mail.

Published blogs

Multi-AKS Cluster Networking & Hub-Spoke Topology

Running more than one AKS cluster changes networking from a setup task into an operating model. This guide covers practical connectivity patterns, hub-spoke routing, cross-cluster DNS, ingress options, and decision criteria that help teams scale safely without adding complexity too early.

Observability in AKS CNI Overlay: When Pod IPs Hide Behind Nodes

CNI Overlay masks pod IPs behind node IPs through SNAT, breaking traditional observability. Network logs show nodes, application logs show pods. Without Container Insights, correlation IDs, and distributed tracing, you’re debugging blind. SNAT port exhaustion mimics network failures, and timestamp-based correlation is fragile. The cost of proper monitoring is trivial compared to debugging outbound connectivity at 3 AM without visibility.

AKS Cost Optimization: Resource Governance That Actually Works

AKS costs are brutally simple: node sizing, pod density, workload sprawl, and reserved capacity. If you don’t have visibility and governance, your cloud bill will punch you in the face—usually when it’s too late to react without pain. I’ve watched teams scramble to cut costs after the invoice lands, breaking production in the process. This guide is for practitioners who want to avoid that mess. No theory, no vendor fluff: just what actually works to keep AKS costs under control without sacrificing reliability.

Storage Architecture & Stateful Workloads in AKS

Stateful workloads in Kubernetes require understanding PersistentVolume architecture, Azure storage trade-offs, and backup strategies. This article covers PVC/PV patterns, Azure Disk vs Files performance profiles, Velero backup configurations, and multi-cluster replication patterns based on production experience.

AKS Cluster Upgrades: Zero-Downtime Operations That Actually Work

AKS cluster upgrades involve node replacement and pod eviction, which can cause service disruption without proper controls. This article explains cordon and drain mechanics, Pod Disruption Budget configuration, and multi-node-pool rollout strategies with validation-driven automation for reliable zero-downtime upgrades.